Summary
Transverse hadron spectra from proton–proton, proton–nucleus and nucleus–nucleus collisions from 2 <i>A</i>·GeV to 21.3 <i>A</i>·TeV are investigated within two independent transport approaches (HSD and UrQMD). For central Au+Au (Pb+Pb) collisions at energies above <i>E</i>lab ∼ 5 <i>A</i>·GeV, the measured K± transverse mass spectra have a larger inverse slope parameter than expected from the default calculations. The additional pressure — as supported by lattice QCD calculations at finite quark chemical potential μ<i>q</i> and temperature <i>T</i> — might be generated by strong interactions in the early pre-hadronic/partonic phase of central Au+Au (Pb+Pb) collisions E.L. Bratkovskaya et al., <i>Phys. Rev. C</i> <b>69</b> (2004) 054907.
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Bleicher, M., Bandyopadhyay, D., Bratkovskaya, E. et al. Transverse Pressure in Relativistic Nuclear Collisions: Evidence for Partonic Interactions?. Acta Physica Hungarica 24, 181–188 (2005). https://doi.org/10.1556/APH.24.2005.1-4.25
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DOI: https://doi.org/10.1556/APH.24.2005.1-4.25